21149-87-1 21149-88-2 4-24-00-02001 (Beilstein Handbook Reference) 5-Ethyl-5-(3'-methylbut-2'-enyl)barbituric acid 5-Ethyl-5-(3-methyl-2-butenyl)-2,4,6(1H,3H,5H)-pyrimidinetrione 5-Ethyl-5-(3-methyl-2-butenyl)barbituric acid BRN 0199837 Barbituric acid, 5-ethyl-5-(3-methyl-2-butenyl)-